Plant Diseases
Particularly troublesome where rainfall and relative humidity are high, and under overtree irrigation, apple scab can defoliate trees and blemish fruit to a point where it is unmarketable. Learn...
Beware Signs of White Rot in Garlic and Other Allium Crops
White rot is a very serious disease of garlic and onion. This three-page Green Thumb publication will help you to identify the disease and prepare a defense against its growth in your garden,...
Choosing and Growing Adapted Vegetable Varieties
Recommended vegetable varieties for short-season, high-altitude regions, including cool-season hardy vegetables; cool-season tender vegetables; and tender warm-season vegetables. Authors: Stephen...
Common Scab of Potato Caused by Streptomyces Species
Common scab of potato is a plant disease caused by several plant pathogenic bacteria in the genus Streptomyces. The unsightly cork-like lesions, which range from relatively superficial to deep...
Diagnosing and Managing Rhizoctonia in Idaho Bean Crops
Rhizoctonia root rot is an important bean disease in southern Idaho crops that has caused from 30% to 100% yield loss, depending on the degree of severity. The culprit is a soilborne fungus,...
Gardening Strategies for Short-Season, High-Altitude Zones
Part of the short-season, high-elevation gardening series, this publication covers plant selection, plant placement, management of plant growth rate and maturity, season-extending techniques and...
Growing Peppers in Short-Season, High-Altitude Idaho Gardens
Peppers are difficult to grow if you garden or farm at high elevations (above 4000 feet). This publication will help you to improve the odds by choosing the best type of soil; implementing season...
Growing Small-Fruit Crops in Short-Season Gardens
Choosing hardy and early maturing small-fruit varieties is critical to gardening success as is using proper maintenance techniques. Part of the Short-Season, High-Altitude Gardening series, this...
Growing Tomatoes in Cool, Short-Season Locations
Part of the short-season, high-altitude gardening series, this publication provides tips and strategies for growing tomatoes in harsh climates. Authors: Michael Bauer, Danny L. Barney, Jo Ann...
Growing Tree Fruits in Short-Season Gardens
Producing your own backyard tree fruit in Idaho's harsher climates can be difficult, but it isn't impossible. There are many types of apples, apricots, cherries, pears and plums that you can...
Hardy Roses for Harsh Climates
Love roses but live in a cold, high-elevation Idaho location? Don't worry. You can still grow many beautiful kinds of the national flower. Stephen L. Love studied dozens of rose varieties for their...
Help Protect the Famous Idaho Potato: Diagnose and Control Late Blight in Your Home Garden
Potato and tomato plants are susceptible to late blight, a disease caused by a fungal-like pathogen that caused the Irish Potato Famine of 1845–52. The disease is still with us today and continues...
Integrated Pest Management of Aphids in Cereals
Insect and disease pests are prevalent in both residential and commercial food production settings, meaning that a large number of Idahoans contend with them each year. Part of an integrated pest...
Integrated Pest Management of Fusarium Dry Rot in Potato
Insect and disease pests are prevalent in both residential and commercial food production settings, meaning that a large number of Idahoans contend with them each year. Part of an integrated pest...
Integrated Pest Management of Pea Aphids in Legumes
Insect and disease pests are prevalent in both residential and commercial food production settings, meaning that a large number of Idahoans contend with them each year. Part of an integrated pest...
Introduction to Short-Season Gardening in Idaho
Part of the short-season, high-elevation gardening series, this publication describes Idaho's three short-season climates (high desert; cool, moist locations typical of the Idaho panhandle; and...
Iris Yellow Spot Virus: A Threat to Seed- and Bulb-Onion Crops in Idaho
Iris Yellow Spot Virus is a powerful viral pathogen that drastically slows onion growth, leading to major crop loss and higher production costs. It first appeared in Idaho in 1989, but has since...
Landscaping with Native Plants
Cultivate healthier soils and more resilient plants on your Idaho property by using plants native to the Intermountain West in your landscape design. This extensive bulletin, with astute insights...
Landscaping with Native Plants
Cultivate healthier soils and more resilient plants on your Idaho property by using plants native to the Intermountain West in your landscape design. This extensive bulletin, with astute insights...
Lawn Care in Short-Season, High-Altitude Zones
Curious about how to maintain a healthy lawn in Idaho's short-season, high-altitude climates? It's a bit more challenging to do than in other areas of the state. Learn how to navigate their...
Managing Bacterial Ring Rot of Potato
Bacterial ring rot, caused by the bacterium Clavibacter sepedonicus, is one of the most destructive potato diseases in the world. Because losses due to stored, decaying potatoes can be substantial,...
Managing Soils in Short-Season, High-Altitude Zones
Part of the short-season, high-elevation gardening series, this publication describes the three basic soil types in Idaho's short-season, high-elevation gardening zones and offers management...
This two-page fact sheet for use in the field offers recommendations for growing onions in Idaho, with pointers or information on growth stages and development, planting, fertilization, irrigation,...
Peach Leaf Curl — Diagnosis and Disease Management in Idaho
Peach leaf curl is a fungal disease that destroys leaves, can cause cracking or corks in fruit, and can kill young peach, nectarine and almond trees if left untreated. With numerous color...
Physiological Leaf Roll of Tomato
This publication helps distinguish between tomato physiological leaf roll and infectious plant diseases that can cause yield and fruit quality losses. Also discusses leaf roll management strategies...
Phytophthora Bleeding Canker of Maple Trees
Bleeding canker has recently been observed on mature maple trees in southern Idaho. The causal agent is Phytophthora cactorum, a plant pathogen capable of infecting over 200 tree species. Given its...
Potato Mop-Top Virus: Biology and Disease Management
Potato mop-top causes dark, internal blemishes in potatoes. Because it is an emerging disease in the United States and no control measures yet exist, growers need to know the basic facts to...
Potato Virus Y Management for the Seed Potato Producer
One of the most serious challenges facing seed potato producers is managing Potato virus Y, which causes stunting, foliar damage, wilting and sometimes plant death, even though some potato species...
Powdery scab is a formidable and damaging fungus-like pathogen that damages potatoes worldwide. It causes gall formation on roots as well as lesions on the tubers, which reduce potato quality as...
Selecting, Planting, and Caring for Trees, Shrubs, and Vines
Because they come in a variety of sizes and shapes, woody plants (trees, shrubs and vines) are unique landscape elements that can provide scale and balance, soften a building's hard edges and/or...
Sharp Eyespot Disease of Wheat and Barley
Sharp eyespot disease is fungal and infects wheat and barley in temperate world regions but also in all parts of Idaho. Its global incidence has increased in the past few decades. Because it can...
Short-Season Vegetable Gardening
Pacific Northwest gardeners often find the growing season too short to grow vegetables. Two horticulturists detail the special practices (including soil preparations, protective coverings,...
Spring Vegetable Planting Guide for Idaho
Idaho's diverse climate makes it a challenging place to grow vegetables, so if you're planning to start a vegetable garden this spring, this planting guide is for you. It provides basic, crucial...
Storage Management of Dakota Russet Potatoes
Dakota Russet is a multipurpose and popular potato cultivar whose Pacific Northwest acreage has expanded in recent years. With increased yields comes larger storage volumes. Based on the results of...
Take-All Disease of Wheat in Idaho
Take-all is a highly destructive fungal disease of cereals whose ability to infect multiple plant parts often results in a crop’s complete destruction. Mainly found in wheat, barley, rye and...
Verticillium Wilt of Trees in Idaho
Verticillium wilt is a devastating soilborne disease to over three hundred plants worldwide, including trees, shrubs, fruits and vegetables. Given the fungi’s wide range, whose infection in trees...